Here are some of my projects:

A renderer for OpenStreetMap-data with integrated webserver. We made it in a project for the university. Surprisingly it became a very nice piece of software and regarding performance we are even comparable to Mapnik, the official renderer. It is made with C++ and boost-libraries and we open-sourced it after our evaluation was done, so you can join our development at github.
This project is a little bit older, I started it in 2009 when I started to learn Python. Since then it changed a lot and was refactored multiple times. I tried to implement a game very popular in the black forest, where I come from. It is called Binokel and is a card game. Maybe it could be described as a mixture of Poker and Skat.
Configuration management with shell scripts
Much of my time goes into configuring and maintaining my servers and their services. To make it easier I tried several programs for configuration management. However I found them all to be overkill for my scale and/or I had to work around their limitations and was essentially putting shell commands into the configuration management system. So why not directly use shell scripts for this? I wrote some helper functions and am satisfied with the results for now.
AUR packages
I maintain the Arch User Repository (AUR) packages for alaCarte and have contributed improvements to several other packages.
Allows you to place several markers on a map and then share it with your friends. The complete project is done in JavaScript and consists of statically serveable files. Try it out on!